669028 has 12 divisors (see below), whose sum is σ = 1232560. Its totient is φ = 316872.

The previous prime is 669023. The next prime is 669029. The reversal of 669028 is 820966.

669028 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (669023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4326 + ... + 4477.

2⁶⁶⁹⁰²⁸ is an apocalyptic number.

It is an amenable number.

669028 is a deficient number, since it is larger than the sum of its proper divisors (563532).

669028 is a wasteful number, since it uses less digits than its factorization.

669028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8826 (or 8824 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 669028 is about 817.9413181885. The cubic root of 669028 is about 87.4610656714.

The spelling of 669028 in words is "six hundred sixty-nine thousand, twenty-eight".